# MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening

(mongodb >=1.13.0)

MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening — Notification method for opening the topology

### Beschreibung

abstract public MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening(MongoDB\Driver\Monitoring\TopologyOpeningEvent `$event`): void

If the subscriber is registered, this method is called when the topology is opened.

> Hinweis: Due to the driver's connection handling and persistence behavior, this event may not be observed if a MongoDB\Driver\Manager uses a previously persisted » libmongoc client.

### Parameter-Liste

`event` (MongoDB\Driver\Monitoring\TopologyOpeningEvent)

  An event object encapsulating information about the opened topology.

### Rückgabewerte

Es wird kein Wert zurückgegeben.

### Fehler/Exceptions

- Wirft eine MongoDB\Driver\Exception\InvalidArgumentException, wenn beim Analysieren von Argumenten ein Fehler auftritt.

### Siehe auch

- MongoDB\Driver\Monitoring\TopologyOpeningEvent
- MongoDB\Driver\Monitoring\addSubscriber() - Registers a monitoring event subscriber globally
- MongoDB\Driver\Manager::addSubscriber() - Registers a monitoring event subscriber with this Manager

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